When training alone or at powerlifting gym, it's always metal - Death, Cannibal Corpse, Pantera, Type O Negative, Fear Factory, Destroyer 666 etc. The full stereotype. I like the loud, intense music goes well with a mind cleared of thought and a calmness before the lift (not into pre workouts, sniffing ammonia, back slapping and yelling etc). The music gets louder and more intense relative to the sets.
Training with my bro mates who like to muck around and pose etc, it's more hiphop like Necro, ICP, Kool Keith, Nas, Mobb Deep etc.
I find it very difficult to train without my own music.